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Well, Steve, the males of distinguenda and muehlfeldi hover persistently, however, those of ciureai and bimaculata never ever hover at all.

They are, what I called in my Dutch key ' look-outers', they are sitting on leaves on the look-out for females. If this is above your head, they are very difficult to find indeed.
We have one record of a dozen of males at night at the street lamp.
Might be a clue.


Theo